f(x)=x^2(x<1),x-1(x>=1).求f[f(-4)]=?谢谢〜

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f(x)=x^2(x<1),x-1(x>=1).求f[f(-4)]=?谢谢〜f(x)=x^2(x<1),x-1(x>=1).求f[f(-4)]=?谢谢〜f(x)=x^2(x

f(x)=x^2(x<1),x-1(x>=1).求f[f(-4)]=?谢谢〜
f(x)=x^2(x<1),x-1(x>=1).求f[f(-4)]=?谢谢〜

f(x)=x^2(x<1),x-1(x>=1).求f[f(-4)]=?谢谢〜
-41
∴f(f(-4))
=f(16)
=16-1
=15